# Discovery of a Very Bright and Intrinsically Very Luminous, Strongly Lensed Ly{\alpha} Emitting Galaxy at z = 2.82 in the BOSS Emission-Line Lens Survey

## TL;DR

This paper reports the discovery and analysis of a highly luminous, strongly lensed Ly{ extalpha} emitting galaxy at redshift 2.82, identified through the BELLS GALLERY survey, with detailed lens modeling and physical characterization.

## Contribution

The study presents the first detailed analysis of a very bright, intrinsically luminous, strongly lensed Ly{ extalpha} emitter at z=2.82, including lens modeling and physical properties.

## Key findings

- The galaxy is one of the brightest and most luminous known lensed Ly{ extalpha} emitters.
- The lens model yields an Einstein radius of approximately 3 arcseconds and a magnification factor of about 8.8.
- Follow-up observations confirmed the lensing nature and provided insights into the galaxy's properties.

## Abstract

We report the discovery of a very bright (r = 20.16), highly magnified, and yet intrinsically very luminous Ly{\alpha} emitter (LAE) at z = 2.82. This system comprises four images in the observer plane with a maximum separation of ~ 6" and it is lensed by a z = 0.55 massive early-type galaxy. It was initially identified in the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-Line Lens Survey for GALaxy-Ly{\alpha} EmitteR sYstems (BELLS GALLERY) survey, and follow-up imaging and spectroscopic observations using the Gran Telescopio Canarias (GTC) and William Herschel Telescope (WHT) confirmed the lensing nature of this system. A lens model using a singular isothermal ellipsoid in an external shear field reproduces quite well the main features of the system, yielding an Einstein radius of 2.95" +/- 0.10", and a total magnification factor for the LAE of 8.8 +/- 0.4. This LAE is one of the brightest and most luminous galaxy-galaxy strong lenses known. We present initial imaging and spectroscopy showing the basic physical and morphological properties of this lensed system.